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monitor blanks ... input with kern.4.4 [SOLVED Hardware]
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albright
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PostPosted: Sat Jan 23, 2016 2:49 pm    Post subject: monitor blanks ... input with kern.4.4 [SOLVED Hardware] Reply with quote

Hi all - this is a strange problem and may be unique to me :(

I have an intel NUC5i7RYB

Since install kernel >4.4.0 I have the strange sympotm that
when I press the keyboard the screen goes blank for a second.
This doesn't *always* happen.

No error messages appear in syslog or .xsessionerrors.

My system is weird because it has a device that splits the mini dp output
to two displayports for dual monitor support (which works fine).

NOte that it is the screen on which the active app (the one I am using
the keyboard to enter data) that goes blank.

As I said this does not happen with kernels < 4.4.0

I should say that I'm mostly running kde 5 but the same thing happens
in a LXDE session.

So I'm just throwing this question out in case anybody has had a similar
problem and might have some advice.
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.... there is nothing - absolutely nothing - half so much worth
doing as simply messing about with Linux ...
(apologies to Kenneth Graeme)


Last edited by albright on Wed May 18, 2016 2:47 pm; edited 3 times in total
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albright
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PostPosted: Mon Feb 01, 2016 6:36 pm    Post subject: Reply with quote

problem still there with kernel 4.4.1

I upgraded 4.3.2 to 4.3.5 without the graphics glitch appearing so it
seems to be a 4.4 issue

nothing in logs or .xsessionerros and it happens with input
(mouse moving over window or sometimes keyboard press)
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toralf
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PostPosted: Mon Feb 01, 2016 6:43 pm    Post subject: Reply with quote

4.4.1 is out - if it isn't fixed there you might report this to the appropriate kernel mailing list.
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albright
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PostPosted: Fri Feb 19, 2016 3:54 pm    Post subject: Reply with quote

still happening on 4.4.2 - there is a kernel bug on this (I think it's the same
problem)

some suggested enabling microcode - did not solve it for me

some suggested switching to uxa acceleration -- this seemed to greatly improve
but not eliminate the problem

typical errors around the time the screen temporarily blanks are this:

Quote:
Feb 19 10:50:21 alatar kernel: [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun


back to 4.3.5 (not that there's anything wrong with that :) )
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albright
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PostPosted: Sat May 07, 2016 3:05 pm    Post subject: Reply with quote

running 4.5.3 for a couple of hours without any screen blanking / blinking

hurray - I'll mark this solved
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albright
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PostPosted: Thu May 12, 2016 4:55 pm    Post subject: Reply with quote

spoke too soon - after rebooting today (after kde update) the problem
is back; really entirely mysterious
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albright
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PostPosted: Wed May 18, 2016 2:48 pm    Post subject: Reply with quote

FWIW (not much, I know) the problem was with the startech
displayport splitter; when I finally got proper cables to use
DP and HDMI everything worked ...
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